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Weather & Climate in St. Mary's, NL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Mary's has a cool climate with an average annual temperature of 42°F (5°C). Winters average 26°F in January while summers reach 58°F in July. The area gets 225 sunny days per year, above the national average. Annual precipitation totals 61.1 inches (wetter than the 38-inch national average). The area receives 21.7 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 43 feet.
Temperature
26°F Jan (-3°C)
58°F Jul (15°C)
| Annual Average | 41.5°F |
| 23% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 58°F (15°C) |
| Sunny Days | 225 days/yr |
Geography
| Elevation | 43 ft (13 m) |
| Area | 14.1 sq mi (36.4 km²) |
| Population Density | 22/sq mi |
| Coordinates | 46.9166°N, 53.5814°W |
| Timezone | America/St_Johns |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.3.
| Apr 29, 2009 | 28 km SW of Bay Roberts, Canada | M3.3 | 54 km | 18 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
9 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Ernesto | Category 1 | 86 mph | 137 km |
| 2021 | Larry | Category 1 | 81 mph | 88 km |
| 2014 | Gonzalo | Category 1 | 92 mph | 110 km |
| 2010 | Igor | Category 1 | 86 mph | 46 km |
| 2001 | Erin | Category 1 | 75 mph | 277 km |
| 2000 | Michael | Category 1 | — | 295 km |
| 1998 | Danielle | Category 1 | 75 mph | 289 km |
| 1982 | Debby | Category 2 | 104 mph | 139 km |
| 1980 | Georges | Category 1 | 81 mph | 241 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1864 | SW AVALON PENINSULA, NEWFOUNDLAND | Earthquake | — | — | 47 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 5.6 in | |
| February | 25°F (-4°C) | 5.1 in | Coldest |
| March | 29°F (-2°C) | 5.4 in | |
| April | 36°F (2°C) | 4.6 in | |
| May | 43°F (6°C) | 4.4 in | |
| June | 50°F (10°C) | 4.8 in | |
| July | 58°F (15°C) | 4.7 in | |
| August | 60°F (16°C) | 4.3 in | Warmest, Driest |
| September | 55°F (13°C) | 5.2 in | |
| October | 46°F (8°C) | 5.6 in | |
| November | 39°F (4°C) | 5.8 in | Wettest |
| December | 31°F (-1°C) | 5.6 in |
St. Mary's has a seasonal temperature swing of 36°F / from 25°F in February to 60°F in August. Total annual precipitation is 61.1 inches, with November being the wettest month (5.8") and August the driest (4.3").